#include <stdio.h>
int main( )
{
float amount=0.0, balance = 0.0;
scanf("%f %f",&amount,&balance);
if (((int)amount%10==5 || (int)amount%10==0 ) && amount>0 && amount<=2000 && balance>=0 && balance<=2000)
balance=(amount+0.5<=balance?balance-amount-0.5:balance);
printf("%f\n",balance);
return 0;
}
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